[media] media: ti-vpe: Document CAL driver

Device Tree bindings for the Camera Adaptation Layer (CAL) driver
Signed-off-by: NBenoit Parrot <bparrot@ti.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/devicetree/bindings/media/ti-cal.txt

+Texas Instruments DRA72x CAMERA ADAPTATION LAYER (CAL)
+------------------------------------------------------
+
+The Camera Adaptation Layer (CAL) is a key component for image capture
+applications. The capture module provides the system interface and the
+processing capability to connect CSI2 image-sensor modules to the
+DRA72x device.
+
+Required properties:
+- compatible: must be "ti,dra72-cal"
+- reg:	CAL Top level, Receiver Core #0, Receiver Core #1 and Camera RX
+	control address space
+- reg-names: cal_top, cal_rx_core0, cal_rx_core1, and camerrx_control
+	     registers
+- interrupts: should contain IRQ line for the CAL;
+
+CAL supports 2 camera port nodes on MIPI bus. Each CSI2 camera port nodes
+should contain a 'port' child node with child 'endpoint' node. Please
+refer to the bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+	cal: cal@4845b000 {
+		compatible = "ti,dra72-cal";
+		ti,hwmods = "cal";
+		reg = <0x4845B000 0x400>,
+		      <0x4845B800 0x40>,
+		      <0x4845B900 0x40>,
+		      <0x4A002e94 0x4>;
+		reg-names = "cal_top",
+			    "cal_rx_core0",
+			    "cal_rx_core1",
+			    "camerrx_control";
+		interrupts = <GIC_SPI 119 IRQ_TYPE_LEVEL_HIGH>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			csi2_0: port@0 {
+				reg = <0>;
+				endpoint {
+					slave-mode;
+					remote-endpoint = <&ar0330_1>;
+				};
+			};
+			csi2_1: port@1 {
+				reg = <1>;
+			};
+		};
+	};
+
+	i2c5: i2c@4807c000 {
+		ar0330@10 {
+			compatible = "ti,ar0330";
+			reg = <0x10>;
+
+			port {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				ar0330_1: endpoint {
+					reg = <0>;
+					clock-lanes = <1>;
+					data-lanes = <0 2 3 4>;
+					remote-endpoint = <&csi2_0>;
+				};
+			};
+		};
+	};